from research import *
s=begin(531,'Integrated explanation and research checkpoint','Can the completed results be presented as one source-grounded explanation of how the chronological families fit together?',{'completed_predecessors':'C482–C530','primary_source':'latest File52c','deliverable':'readable synthesis plus reproducible50-step record'},['Strategy v0.2','C482–C530; independent reviews'])
draft=ROOT/'490d_How_Chronological_Families_Fit_Together_Draft_20260927.md'
checkpoint=ROOT/'490d_Research_Checkpoint_After_C531_20260927.md'
body=draft.read_text();reviews=list((ROOT/'evidence').glob('INDEPENDENT_REVIEW_*.md'))
finish(s,{'draft':draft.name,'draft_sha256':hashlib.sha256(draft.read_bytes()).hexdigest(),'checkpoint':checkpoint.name,'checkpoint_sha256':hashlib.sha256(checkpoint.read_bytes()).hexdigest(),'completed_range':'C482–C531','bounded_actions':50,'independently_reviewed_analytical_steps':48,'review_notes':len(reviews),'next_proposed':'C532:source-defined161/299/460 reconstruction under the frozen grammar'},
 'The readable draft explains the family relationships through shared operations, conserved quantities and explicit source junctions. The completed journal retains a reassessment after every action. Forty-eight analytical steps received independent review; the final two consolidate review and synthesis. The next source-family test remains unexecuted.',
 'Use this draft as the shared big-picture account; if research continues, perform the proposed C532 bounded reconstruction without reopening already resolved audits.',{'draft_exists':draft.is_file(),'checkpoint_exists':checkpoint.is_file(),'operations_diagram':'```mermaid' in body,'cross_family_table':'8464' in body and '11599.6' in body,'reviews':len(reviews)==4,'scope':'Second-order inversion remains deferred' in body})